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Old 09-12-2003, 12:35 AM
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MalHavoc MalHavoc is offline
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It's possible that he was measuring "general hardness" rather than "carbonate hardness". The latter is generally unaffected by Mg levels, but the former is definitely affected, since the Mg:Ca ratio in sea water is usually 3:1.

Having a high Mg level helps you maintain a high calcium level, by the way.
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